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target/s390x: Implement SRSTU

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Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2017-06-18 11:31:24 -07:00
parent 7591db780d
commit be7acb5839
4 changed files with 57 additions and 0 deletions
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1
target/s390x/helper.h
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@ -13,6 +13,7 @@ DEF_HELPER_FLAGS_3(divu32, TCG_CALL_NO_WG, i64, env, i64, i64)
DEF_HELPER_FLAGS_3(divs64, TCG_CALL_NO_WG, s64, env, s64, s64)
DEF_HELPER_FLAGS_4(divu64, TCG_CALL_NO_WG, i64, env, i64, i64, i64)
DEF_HELPER_3(srst, void, env, i32, i32)
DEF_HELPER_3(srstu, void, env, i32, i32)
DEF_HELPER_4(clst, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_4(mvn, TCG_CALL_NO_WG, void, env, i32, i64, i64)
DEF_HELPER_FLAGS_4(mvo, TCG_CALL_NO_WG, void, env, i32, i64, i64)

2
target/s390x/insn-data.def
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@ -737,6 +737,8 @@
/* SEARCH STRING */
C(0xb25e, SRST, RRE, Z, 0, 0, 0, 0, srst, 0)
/* SEARCH STRING UNICODE */
C(0xb9be, SRSTU, RRE, ETF3, 0, 0, 0, 0, srstu, 0)
/* SET ACCESS */
C(0xb24e, SAR, RRE, Z, 0, r2_o, 0, 0, sar, 0)

41
target/s390x/mem_helper.c
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@ -576,6 +576,47 @@ void HELPER(srst)(CPUS390XState *env, uint32_t r1, uint32_t r2)
set_address(env, r2, str + len);
}
void HELPER(srstu)(CPUS390XState *env, uint32_t r1, uint32_t r2)
{
uintptr_t ra = GETPC();
uint32_t len;
uint16_t v, c = env->regs[0];
uint64_t end, str, adj_end;
/* Bits 32-47 of R0 must be zero. */
if (env->regs[0] & 0xffff0000u) {
cpu_restore_state(ENV_GET_CPU(env), ra);
program_interrupt(env, PGM_SPECIFICATION, 6);
}
str = get_address(env, r2);
end = get_address(env, r1);
/* If the LSB of the two addresses differ, use one extra byte. */
adj_end = end + ((str ^ end) & 1);
/* Lest we fail to service interrupts in a timely manner, limit the
amount of work we're willing to do. For now, let's cap at 8k. */
for (len = 0; len < 0x2000; len += 2) {
if (str + len == adj_end) {
/* End of input found. */
env->cc_op = 2;
return;
}
v = cpu_lduw_data_ra(env, str + len, ra);
if (v == c) {
/* Character found. Set R1 to the location; R2 is unmodified. */
env->cc_op = 1;
set_address(env, r1, str + len);
return;
}
}
/* CPU-determined bytes processed. Advance R2 to next byte to process. */
env->cc_op = 3;
set_address(env, r2, str + len);
}
/* unsigned string compare (c is string terminator) */
uint64_t HELPER(clst)(CPUS390XState *env, uint64_t c, uint64_t s1, uint64_t s2)
{

13
target/s390x/translate.c
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@ -4298,6 +4298,19 @@ static ExitStatus op_srst(DisasContext *s, DisasOps *o)
return NO_EXIT;
}
static ExitStatus op_srstu(DisasContext *s, DisasOps *o)
{
TCGv_i32 r1 = tcg_const_i32(get_field(s->fields, r1));
TCGv_i32 r2 = tcg_const_i32(get_field(s->fields, r2));
gen_helper_srstu(cpu_env, r1, r2);
tcg_temp_free_i32(r1);
tcg_temp_free_i32(r2);
set_cc_static(s);
return NO_EXIT;
}
static ExitStatus op_sub(DisasContext *s, DisasOps *o)
{
tcg_gen_sub_i64(o->out, o->in1, o->in2);